Fabrication of High-Performance Solar Cells and X-ray Detectors Using MoX₂@CNT Nanocomposite-Tuned Perovskite Layers

Abstract

The interface design of inorganic and organic halide perovskite-based devices plays an important role to attain high performance. The modification of transport layers (ETL and HTL) or the perovskite layer is given the crucial inspiration to realize superior power conversion efficiencies (PCEs). The highly conducting 2D materials of CNT, graphene/GO, and transition-metal dichalcogenides (TMDs) are suitable substitutes to tune the electronic structure/work function of perovskite devices. Herein, the nanocomposites composed of molybdenum dichalcogenides (MoX 2 = MoS 2 , MoSe 2 , and MoTe 2 ) stretched CNT was embedded with HTL or perovskite layer to improve the resulted characteristics of perovskite devices of solar cells and X-ray detectors. A superior solar cell efficiency of 12.57% was realized for the MoTe 2 @CNT nanocomposites using a modified active layer-composed device. Additionally, X-ray detectors with MoTe 2 @CNT-modulated active layers achieved 13.32 μA/cm 2 , 3.99 mA/Gy•cm 2 , 4.81 × 10 −4 cm 2 /V•s, and 2.13 × 10 15 cm 2 /V•s of CCD-DCD, sensitivity, mobility, and trap density, respectively. Density functional theory approximation was used to realize the improved electronics properties, optical properties, and energy band structures in the MoX 2 @ CNT-doped perovskites evidently. Thus, the current research paves the way for the improvement of highly efficient semiconductor devices based on perovskite-based structures with the use of 2D nanocomposites.

Tuning of electron transport layers using MXene/metal–oxide nanocomposites for perovskite solar cells and X-ray detectors

“…A device composed of pure PCBM ETLs produces approximately 60% of the EQE curve in the visible region of wavelengths owing to their intrinsic characteristics. 64 Further, the EQE profile evidently increased for the 2 wt% of nanostructure-doped ETL-composed devices. A trend of EQE profile suddenly increasing was observed (from a null to 88%) between the 300 and 600 nm wavelengths for the 2 wt% MXene/Fe 3 O 4 -doped PCBM ETL-incorporated device.…”

Photodetection Enhancement of PdSe2/ReSe2 Van der Waals Heterostructure Field‐Effect Transistors: A Density Functional Theory‐Guided Approach

“…The electronic and optical properties of XSe 2 (X = Pd, Re) were calculated using DFT [ 29 ] based on the full potential linearized augmented plane wave (FP‐LAPW) scheme employed in the WIEN2K code. [ 21 ] The WIEN2K code is a persuasive DFT‐based computational tool for investigating the ground state properties of crystalline materials.…”

Assembling highly efficient X-ray and UV-visible light detectors using a VS2–MoS2 and VS2–WS2 hybrid composite-embedded perovskite layer

“…The energy band arrangement between the perovskite and the transport layer interfaces (hole transport layer (HTL) or electron transport layer (ETL)) can be tuned by introducing appropriate doping materials. 34,39 The incorporation of two-dimensional (2D) TMDs into perovskites can afford compact lms with more evenly shaped grains. 40 Organic-inorganic perovskite materials offer enhanced optical and electrical properties such as low excitonbinding energy due to a high dielectric constant, low photocurrent loss due to a long carrier-diffusion length, excellent carrier mobility, and high light-absorption ability.…”

“…The energy band arrangement between the perovskite and the transport layer interfaces (hole transport layer (HTL) or electron transport layer (ETL)) can be tuned by introducing appropriate doping materials. 34,39…”